Deprecate get_x methods

[constantoine]

• Deprecate get_x methods
• Provide to_x alternatives

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.28571% with 12 lines in your changes missing coverage. Please review.

Project coverage is 94.33%. Comparing base (f41abf3) to head (4d31fe8).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/lib.rs	88.34%	12 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage   94.88%   94.33%   -0.55%     
==========================================
  Files           6        6              
  Lines        1447     1378      -69     
==========================================
- Hits         1373     1300      -73     
- Misses         74       78       +4     

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